Device for drawing wire



Jan. 1, 1935. R, PATTERSON I 1,986,777

DEVICE FOR DRAWING WIRE Filed Jan. 23, 1934 Z 12 I 25 5 Q g] v 17Imzenfor:

HENRY E. PAT ERSO Patented Jan. 1, 1935 mm OFFICE DEVICE roannao HenryR. Patterson, Pittsburgh, Pa, assign to The American Steel and WireCompany of New I Jersey, a corporation of New Jersey Application January23,

1934, Serial No. 707,987

2 Claims. (Cl. 2(95-25) This invention relates to devices for drawingwire, and has for one .of itsfobjects the pros vision of novel means forthe relatively slow cooling of dies, and particularly those composed oftungsten carbide.

In using dies of this type, a great amount of heat is imparted to themby the frictional contact of the material being drawn; and it istherefore highly necessary that they be cooled.

The cooling must, however, be done slowly, or

the tungsten carbide will crack.

Another object of the invention is to provide novel means for holding adie in such'manner as to permit of its cooling without being in contactwith the coolant.

The foregoing and other objects will be apparent after referring to thedrawing, in which:

Figure 1 is an elevation of the novel device of the invention; and

Figure 2 is a sectional of Figure 1.

Referring more particularly to the drawing, the numeral 2 designates. ablock which is adapted to fit within the usual opening in the drawingbox on a wire drawing bench. This opening is ordinarily for the purposeof accommodating a plate having a plurality of drawing apertures.

According to the present invention, the block 2 is provided with anenlarged central aperture 3 extending partially therethrough. The innerface of the aperture 3 is annularly grooved along a portion of itsdepth, as indicated at 4, and in such manner view on the line 11-41 asto provide on one side of the block 2 an annular inwardly extendingflange 5 having a central aperture 6. The block 2 is drilled, as at 8and 9, in such manner as to provide inlet and outlet conduits,respectively, for the the distribution of a coolant, such as water.

A bushing 12 is made to fit within the recess 3, in the block 2, andextend through the annularly grooved portion 4. The bushing 12 isprovided on one of its ends with an annular inwardly extending flange14, which, when the bushing is placed in the aperture, seats against theannular inwardly extending flange 5 of the block 2. The bushing 12 isprovided on its other end with internal screw-threads 15.

A die 16, which is preferably composed of steel, is provided with a nibor insert 17 of tungsten carbide. The entrance angle 19 of the dieinsert 1'1 is sufficient .to permit of the introduction of a suitablequantity of lubricant, such annular groove 4, which may be used for as,for example, soap, into its area of drawing contact.

The die 16 is held in the sleeve 12 against its annular inwardlyextending flange 14 by means of a plug 21, which is provided with acentral 5 aperture 22 to permit of the introduction of the wire beingdrawn. The entrance angle 23 of the plug 22, is of less inclination thanthe entrance angle 19 of the die insert 17. This is for the reason thatthe lubricant used in the process of drawing may enter the aperture 22in the plug and pack into the area provided by the greater entranceangle of the die insert, and form a hard mass, or what might be termed alubricating plug. Such a packing serves admirably to protect the dieinsert from foreign matter entering on the wire being drawn, and assuresuniform lubrication of the surface of the wire.

The plug 23 is provided with external screw threads 24, which cooperatewith the threads 15 on the sleeve 12, and is rotated into position bymeans of the usual apertures 25,which permit of the use of a specialwrench.

It is to be noted that as the coolant, which is usually water, flowsthrough the inlet 8, around the sleeve 12, and out of the outlet 9, itwill not come in contact with either the steel die 16 or its tungstencarbide insert 17, and thus there is obviated the possibility oi theoccurrence of corrosion.

While I have shown and described one specific embodiment of myinvention, it will be understood that I do not wish to be limitedexactly thereto, since various modifications may be made withoutdeparting from the scope of my invention. as defined in the following Iclaims.

I claim:

1. A device for drawing wire comprising. in combination, a die holderhaving an enlarged axial aperture, the wall of said enlarged axialaperture having an annular recess of a width which is less than thedepth of said axial aperture. said die holder having a central aperture5 communicating with said enlarged axial aperture and its annularrecess, a sleeve for lining the enlarged axial aperture of said dieholder and its annular recess, the inner end 0! said sleeve beingpartially closed by a centrally apertured wall, a wire drawing diedisposed in said sleeve and in contact with its partially closed end, ahardened insert in said wire drawing die, and a plug which isscrew-threaded into said sleeve for maintaining said wire drawing dieand said hardened insert therein, said plug having a central aperturecommunicating with the wire drawing bore 01 said die, the aperture ofsaid plug having a lesser inclination to the axisof the wire drawing oreof said die than the inclination of the bore of its hardened insert..

2. A device for drawing wire comprising, in'

sleeve being partially closed by a centrally apertured wall, a wiredrawing die disposed in said sleeve and in contact with its partiallyclosed end, a hardened insert in said wire drawing die, and a plug whichis screw-threaded into said sleeve for maintaining said wire drawing dieand said hardened insert therein, said plug having a central aperturecommunicating with the wire drawing bore of said die, the aperture ofsaid plug having a lesser inclination to the axis of the wire drawingbore of said die than the inclination of the bore of its hardenedinsert, said die holder having water passages in communication with theannular recess in its enlarged axial-aperture.

R. PATTERSON.

